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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5bc6b04bafd9f8b5eea5a06cc345b4d7bf1b33d81b9972471a3676f9ed11c6b' 
  AND token = 'BpFCNiwexOhDx17PYOCgyC5zg3ruEB5PzKotNmkbzwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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