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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eae03f53e0b242cd1df2784945b7174773cfbf5e42161da05a20e464820fa27' 
  AND token = 'vI0PqPvnpobG3ciG8Vz7iqko3z1TJ4xrH3L+jI3qj64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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