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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c061989311d5ec7384c2be8bf42a5bb620863b4a2e0b037ea73d4d4604cdcae' 
  AND token = 'W24IRN9jCbgjnl5866W7cfnZ4qpKZubwDfXqZdfbzIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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