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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c39d601e15182a912d85830883bba7bf360254d28841cb71176d815a0c841144' 
  AND token = 'QWep+blo4BbnRG4mFQbMcsAw8nNxd0AU59MIA6n2Lv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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