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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f096cf1198abe52ac5b6ac93155db9b9d65d6e1ea1578e4277797f76f18b790' 
  AND token = '7QkxYlpT0EJG5o3dgqP0gMnY8+lLQWZ8Cfc60sUDye8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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