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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '124aec243fec05ee683d547f2c8fa0d619702d4dc6f150959fdfc6df0cd4dae0' 
  AND token = 'HJv/cbdAB7voENU++F5xtNh27Sr54tgD7b1h9YAtKxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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