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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '242788bddb040dc04d41f7a59fd77ba6bfa3612847c1eb8c58d865f49de0c5de' 
  AND token = 'M9BctFNBcnnIaX1SL5LFovr3vKs2RkBHOjCN/E41Pac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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