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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8383af87794654ec424c6881320e2986bda8099a7e561ab294af8142b8ef7dd' 
  AND token = 'WqWq+blbNJKd2666E+iPH9hfFze8a3T6p2CecP8Dzpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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