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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07fe6ea00b490588ed6ecfb1427d015199e05c2a431f140369d6a741a751af0' 
  AND token = '38WGipGtsKcU/CveZd+EQW/FQYjZOt8I92eVATNZ0SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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