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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0524be379bcb8f55d86bdbbe3c7e7411f7d4bff8376bcd7dd11c07d405c0b22' 
  AND token = 'KQ3C8IogzKwwBJ7J0k4dMEGULJmNndFHV1d3Vh8LhkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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