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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd568bd58ffd9ecf22a3ad145c1ff1ceac687a18128c01672c282d8345e3c910d' 
  AND token = '6MsgcG7yHZb7x/aEdGg2mrlF0yEIG7uMza/IoNOBUpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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