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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dfcbcd4679312b811280b5c08fc4f4fb450a98cbd6c2e457504d940e2b09b5b' 
  AND token = 'sCJBsTv+3qOhf8k2qSQecO92Pd/gsVUglC0rXG5QUJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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