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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd4fdbd9b033056da6dd037e37c07f21c0986a4f57cd31cc4ccb85314e88c2dd' 
  AND token = 'ysHI9FIUZ5UVNOHLpgCpeKe0mm4/PZze4g1OAWN9iBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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