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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a8d6976ec0c7d2547345ffeaa4f9aaa84afaa90198a598fe37083643bd27eea' 
  AND token = '4vvErwxTdF4n02Fq90oGf1tiRy1I6xwCnWR4eTtPncA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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