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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d97792261a454466287b395cb837ec581a6881d49d2c33b6fc500ecf935ce3' 
  AND token = 'n96rl29g35+Bpx/7k1+CQMvR5qxDgEAt967MhJYc5pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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