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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3772da99887f3c2cd830614fc6d45d1dda5138647b0348a74f2c1715a5a3f51e' 
  AND token = 'fXcjb1IldGyb+YnAQmM2LF/PteHrkXsvlsKSlrKz0GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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