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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7908dc96c987e7354240a5edf10c3df5c7200d80da5756acff4aa410d1a9b656' 
  AND token = '171U7KiHMXmjD0+SSQSPlPzDZrPeMK8uG1nPznfsLzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}