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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd99ad229822b6599cc8e84ecfcf6a376c9ddd3e6ce754a5003335870f7e40b6' 
  AND token = 'RNUxRhmnSrY3AiATC3JGFfW2j/U2o9K++S91kn/wS1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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