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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b69d81fdde7ee750a15623951802c8704ce55883462acb7af8d4a72e6ef0506' 
  AND token = '0ay17mgaubXZPe0/WOY7GCs9ZHTwtjFLFfOz+W+MZv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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