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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b3ae6ec6d1905dc90e01b5ee9369e55036c33602511cda3a6f374283787fecd' 
  AND token = 'KJP1hCIpUWniPUPaAVen0LlNeaOqf0DPdAzagKChSwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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