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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e792bbe6994d53d76046d15a75cc6738783ec15ac59daba469b45c79dc99b77d' 
  AND token = 'QQiyfxo/y+WD5dvvvAG4bn4+TkwvSEozLNTAMoHhor0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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