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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6214cad7da877c0195be4672d54b52f8782818eee93e0274dbdff07c233abae9' 
  AND token = 'h6NT6ktxpzIAbJNXAU0OBUELZz4D8BIMtsVm0khlX8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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