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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8849a493093190c309ea2e11b037124f47fe46988c2c087e81abd0bf9f11365' 
  AND token = 'guB2nAbdS9pqRcu/ebKVS/C6YLcOtJQLMJ2mQYaNvjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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