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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e50630ebaa1a14045ab8ce1700e33caa614be03657fefd647ca0d2fe12b02b' 
  AND token = 'cgtv0aIHujLIavmQnk05od0+PrY8P0fDpFRSCO6zUfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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