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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '017cf885e6f21e07931fefa2ef63c3cbaafe13cde2483446bae7a44ae7b80e3e' 
  AND token = '9P5tnIPP5IWNdCV41NDuWonWp9pe1vwjmHsMmZ5Iscs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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