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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf5a4b486cfd3fecc92d9ba2c0ddf1a3fc7e2821456240ea76ba4978c7bcf61' 
  AND token = 'JLnrHfz4rm2LwWHz2dXxcM80w6Rszd7RMtDdtdx4lFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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