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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44e9c2809071967b1a72c9ce146c45c23d521fbdd2c8968668a6321a530a5511' 
  AND token = '6znBhU0UTZYeLS0KvWvojdFDopuS91l4lcbp41JQNg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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