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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '921715cda59a2cf7c8bbf0bee7fe0588ae70a0f1539c8d7e9293c3f75c327732' 
  AND token = 'Ld2AmF7LaUCU/TrevJbGC+PHacR+GWmGxllkJE4KVRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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