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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58fbc58047ef15193598d25ae73a997e0f8c4b1bd25bc7ff9c5461c71219d872' 
  AND token = 'Z9fImc9VLC7V3RNrGUKyn6FUFJMPcLHUvMwIZw03cJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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