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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '389f4a5b36db38947f86da747349d8b1b6f4dd160de7ccbd9e76bc6b7d2ae766' 
  AND token = 'ByXX97Taj5WA48LGtRiZ1JJRdRUW+kdLka6x90p0j4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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