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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ec13bf9dbab52ff0243db443efd90d48bb556b240a6c5123908f1e847ede42e' 
  AND token = 'HY+z2zsE8pe2rRKwdWgx8k4z9Sxy6nOjY2Ka8RLG6vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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