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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80b2304d969bcf343a9155decc85153085606033f85268b5639dc80db5838b64' 
  AND token = '6kKtatenuvKTP0FsKbvw2BIgAwIVHzU/GcJcsCwnYw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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