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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd97f7fafbb4b2f2057579ea2f4519835196da2cf6e26f534712ee1ed7a62be67' 
  AND token = 'YjgO8jqS4+206cu4E+yMWDlkOD8GJi8RUQStf/xgGT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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