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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '606aaa4d9c3733ff4ba43888d9df83aec33f0991c2a2ebd9405e7486bbcdd87a' 
  AND token = 'SXzqOVe8DSzhKmuZqe0yGX6Q8whv43SXEJfE7O2etd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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