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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2551577c00d9844742c5e14873f3f8566a80ce1193a902e8720a828ab40618dc' 
  AND token = 'EPPwcmBQ5oVV0GsgBpKHUlEDwCcZF86aOmGhh7nweck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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