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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e17d69cc3e4c7583448597cc45d39cfc09852b792bf2600bb08d884bbf618c6e' 
  AND token = 'nQtBGqnEOD+EHZFbgQ3HOSppjg4U99Nlf6f5uSIXT74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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