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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411e868fe13dd2c7e2358a35089e5fbdaf3f582865b359be9ad552518e7e5c10' 
  AND token = 'nQyzC9aOO1ZgRbZ3jjAhQKqAGr7+jmU9+y3GE/IXWk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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