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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3419aaf064998978d581bbd4a03a4b4169717b9acf1bbda33247ee54cee4ee89' 
  AND token = 'na/SBltPWMX0W9xWMPyheI7I7oNEjOBREVCEkKHhkuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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