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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d4964c217101b957e6d540770645cf9bb0b5394639cfa05802cc628ee4717bb' 
  AND token = '90LyODSZwG3pYQSWN0+yxadMhqs5bDlz7BsAxR1vo3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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