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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0139a45fc4d85accd55160a14dfd550df2cc4134c40d22088b748e4e484b719d' 
  AND token = 'kEdJkwW5+r8eHM360imhzrqub0NyuhAWA0e+0R0i+YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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