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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2970ac981c0e2155fea7d9c9085cfc22d25aa61c56d4d2f51cc9a29285dd46' 
  AND token = 'QVssUIOIJInyVmt6LaFxSe/ZRQCpqr08wSvR0rt/rSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00256

JSON explain

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