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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13d3176366908f14e78d6c811212098ea4cb48b17b191b095c1f985c625361e' 
  AND token = 'KUZWRA97wkmnnsvm/FmbRnhk7A5RBQrVmxbel4eVh3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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