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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1aad5e68a3bc7d719284618174a480a6ec5bc5930070452435f718d09921428' 
  AND token = 'daW1Qe9taFXQGJ15HomZ4Fdu3CKXZcnzmz3++x1KA/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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