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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1437a2d1a36c924b0ee974aa3aa098a8e77a4c04eb7c48ec5ab0e25131da1f5b' 
  AND token = 'U55HYNtJEhl8YvX41s5rU57PDloN70OxSa8EgRvm/o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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