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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa53ae5e88d9f2315d043d166f25a412e775ffeca637e6f01138cb8510c58c1' 
  AND token = '4oH62Wsn5czQQSr3dgKr27YJT2F3JTN64katg7cV4X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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