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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1463672d4dd4db69f19b9c5e2f33e74efd8d8114f8d183a2d7dfc4642ee5c313' 
  AND token = 'g+TI09WQpEZoJVf6zcSp3Nieaaej9wkys6lErrJwHI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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