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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a6bf54d224ec174ae689e90911d398940b4aadcb761736e8ee313d0e34500df' 
  AND token = '5fBrXdjFe+gPenLQfYX/Z9rTqXko43clSv0krFS4c0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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