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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bdd909d8437f69a4b0e1f4bc824e614601d08a7e4bdc625068b67c19ebb6595' 
  AND token = 'NnJP4AT3NlUvQ4c8J15T0CJT7RpDtuwdDb/50LRmseE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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