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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e40acdaa2cd08f5cea7ac5777698d51028ce086c7d9e664995c34661c975810e' 
  AND token = 'lKxg7WSlCVl/ZKm8eWsU+vvmsDQxaLW10NO3xCcDm40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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