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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e903dc79f430904cf214cbcfdc64180041b0a25c25f52bdbfcb6236bf7210cbf' 
  AND token = 'JhL4J4DhrqGhZn2T3W6eejv7cnskJPA//pB6G8XPD3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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