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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9817ca80204a54c51b0c4d12f6b116dca0c929c9867f1a4819926e9bad84ee' 
  AND token = 'Vi6/2gHmfclMt86RocjYJv3McoYXg2g3L3c/0RJVLuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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