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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9294d71e1b66931c1a3bdb948a96b50b7447a4578a12b9f2ff99bcffa0dac920' 
  AND token = '9eADouCHmiJhtBGMi4JfFCSNukCrXZTDcu6yXEmVwhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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