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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35361dbc78da316dc95b47bf030e5e72f7e96fb054ff0cb33760c4b9fe32b77a' 
  AND token = 'hQ8emiIhYHCd4Jb0tTDF4g0S8scp5vn2zx6g7TCXj58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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