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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ab79bee094627432f34d4c8210d002686aa7c0a8b2acedecafb8af0b30337f' 
  AND token = '5a3NwgyGdGxHN8eajf4WV7CHw8hsInNvLQC9nyQEPeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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