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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fae38643fb65f6eca0d45575396561204ab8f682b58906c4cfa4c884ed2541c' 
  AND token = 'ykH6+47s/bg/sdxpShi3bCNQW4Z4DHu6Dzg4aIoYqoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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