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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08d5123be9d90b6d48b311857fc7fc8ac1946c22b63be4517882cb3164fa168d' 
  AND token = 'B9jEsKtoDRAB0V2ZoTloFsPF5Hq0wIvbL3Fc3VOCWgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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