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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4588057dfc5c8a35b684d877385c611b870a6cdb4239cb27fbfd94ba8d5adfd' 
  AND token = 'Z8xR8YA018C8f3U7c96RvgnvAOUU/0rLvnERRK1SGlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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