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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adcb639d1f9abbb916eca5c7f781bf699b245824d57fe55c53fb45b710b2d9cd' 
  AND token = '91id9OpZo6FHnr2B52Lh8S/3XVUsS9XLRXfEbE0LJGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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