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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee252f1e822bd3026049db1a1318391ac9ab811dce6e830e8bfef5b3065554c' 
  AND token = '8dCUkdtXvctmTwdCxiEjr/K6EQNjrKy2EWY3pKT4X+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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