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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcebc0427d81ece77865a0ffdfd8e68e2a2814e09b3115f5c9bc73f45cc7893e' 
  AND token = 'RDo5v1sFzNS4rXAQEta758wNwdNraKAgwp4bwZHV0Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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