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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67eefc0600fe52f6906f1d9438998cbde2e29c76a5dc6081315aaa77e7d911b9' 
  AND token = 'sZfoFrkBSmS6rf9qVW2dT+BhjIDXaUHmdVQoMvJAQYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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