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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f951f3397bbd290aa9e3ee6d4685a495644cdd900d4de871c503ad8ecebbabf' 
  AND token = '/b/7/5JbzURzX43oNY9G2fdppMMINldcPpx32QHtv+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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