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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc55c8735161242e8d6d90b0b6da0d040ca8ea67ef50dcb0a9b72563db223b08' 
  AND token = 'yklMsucONn7BkiEzKL8nekeqsJ9ZMRPKRkhpoEMBBSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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