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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2948c3bdd79a7bb8477617724c298e7ed88fba8bdcdef86a9cabb7cb5cf89063' 
  AND token = '7HBj0i1vo2fedUAIFXDev9Em0HT/fJ5OAo9wx+Y21ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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