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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a2fe6e7e62d77377f60549d02c57a9d15a1cd514c62d42e632142b7513d6cf' 
  AND token = 'JWe70nZpKkO4UQ1+cEVDJi+PXEKDdESqn69/POd+z5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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