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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff8cb0fa5921d883b2fbecf0ec455c10519bc777a1c846b829095ce25281b04d' 
  AND token = 'zevRmgW5rKrLyPv4NJv2qBFFrOH/dN5r+osAEmgDZX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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