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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30724e72bd08290c3ad368a3d6551e084fe6947ab6b2d332d99589424f9b8e56' 
  AND token = 'z0EOCgx2Xi9phH56+gUaCBuCwtBxJxkVOqUmDaTo2RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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