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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec886d6502ee0cbe1146a0e7ccb16701abd5b5378a0ca230b009cc2bf14f52f' 
  AND token = '0jbUalj7/CgDPtJskco0WT1pmT+zGOBHeigxWSM0BG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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