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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b50f69711ceea4586b113278abce8308621994aadde9a6257fb3e2944907e36' 
  AND token = 'WhsMbKCUl0EgYMHH0wS/QjS2an33Ml1zWwaZEzHxtyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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