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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde46a6e86d4c75e53e7b9affb2af867cb0e611fa387ec2935400595b95d78f8' 
  AND token = '6g0YUiqq7OuQGgvOoLaCrOuHeORlcuPz9BfwFjStcOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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